The partnership agreement defined “Partner”. It defined “Principal”. It did not define “party” — and the arbitration clause applied to disputes “between the parties hereto”. In 1171757 Ontario Limited v. 1171758 Ontario Limited, 2026 ONSC 4414, released July 29, 2026, that omission gave a family member who was neither a partner nor a principal standing to arbitrate, including standing to seek dissolution. It is a drafting case dressed as a jurisdiction case.

The family and the structure

The business is two hotels and a fitness centre, held in trust by Parkway Hotels and Convention Centre Inc. for a partnership formed in 1996. The partnership units are split equally between 1171757 Ontario Limited (“757”) on one side and 1171758 Ontario Limited (“758”) and Miss Britt Realty Corp. on the other. John Kaptyn was the sole shareholder of 757’s predecessor; his son Simon held 758’s. John died in 2007 and left his 757 shares equally to his grandsons Jason and Jonathan — but he made the bequest conditional on Jonathan first granting Jason a power of attorney conferring a permanent proxy to vote those shares. Jonathan did so. Since 2006, Jason had been running the properties through his own company, Kaptyn Enterprise, Inc. (“KEI”), under a management contract with Parkway carrying a $200,000 annual fee — a contract that expired in 2010 and which the parties simply carried on.

In 2024, Jason asked Simon to increase that fee. The disagreement escalated into arbitration, in which Simon asked to terminate the KEI contract and dissolve the partnership. Jonathan then asserted a right to participate as a party — opposing Jason, seeking dissolution on different timing, and seeking more compensation for maintenance services he provided to Parkway. Jason’s position was that Jonathan, being neither a partner nor a principal, had no right to be there. The arbitrator disagreed, and Jason applied to the court under s. 17(8) of the Arbitration Act, 1991.

Why “party” meant more than “partner” or “principal”

Iacobucci J. began where Sattva requires, with the wording. The agreement refers to three classes of actor — partners, principals and parties — and defines only the first two (para. 65). Article 17.1 is not restricted to partners or principals; it applies to disputes between “parties” (para. 66). That distinct usage was treated as deliberate.

Two provisions carried the result. First, the recitals: John and Simon each signed the 1996 agreement twice, once as directing minds of the corporate partners and once individually, and the recitals identified them individually as the “registered and beneficial owner” of all the shares of 757 and 758. As individuals, therefore, they were parties by reason of their shareholdings (paras. 30, 70). Second, the enurement clause, Article 23.7, bound and benefited “heirs, executors, administrators, successors, legal representatives and permitted assigns”, which carried party status to Jason and Jonathan when John’s shares were gifted to them (para. 71). The reasoning does not sweep in all seventeen of John’s heirs — only those who became registered and beneficial shareholders of 757 (para. 36).

Jason’s read-the-whole-agreement argument cut the wrong way. He pointed to Article 18.1, whose non-competition and confidentiality covenants bind partners and principals but not “parties”. The court found that consistent rather than contradictory: it makes commercial sense that a party with no control rights is not bound by a non-compete (paras. 74–76).

Two arguments that did not work

The power of attorney affected status, but only the wrong kind. Because Jonathan ceded voting control of 757, Jason is a principal and Jonathan is not (para. 92). The POA did not touch Jonathan’s status as a registered and beneficial shareholder, which was the source of his party status (paras. 93–94).

The post-signing documents: Both sides had them and neither got value. Jonathan relied on a 2010 agreement signed by all three men to amend the partnership agreement (no amendment was ever executed) and on a 2016 letter of intent in which they signed as “owners” and expressly acknowledged that they were “currently parties to the Partnership Agreement”. Jason relied on counsel memoranda. The court used none of it, because Sattva confines surrounding circumstances to objective evidence known at or before contracting (paras. 86, 89–90). A signed acknowledgment of party status in a letter of intent is not an amendment — and may not even be admissible to interpret the agreement.

Scope: reaching contracts held with the trustee

The arbitrator was also held to have jurisdiction over compensation under service contracts that KEI and Jonathan each held with Parkway rather than with the partnership. Parkway holds the properties in trust, the trust agreement authorizes the partnership to direct it, and Article 4.2 requires written authorization of material transactions including the employment terms of key personnel. Because the partnership can tell Parkway what to do, disputes about what Parkway pays concern the “implementation” of the agreement and are arbitrable (paras. 104–111).

What to take back to the drafting desk

• Define “party”, or write the arbitration clause in terms of the actors you did define. “Any dispute between the Partners” would have ended this application in a paragraph.
• Treat recitals as operative in effect, and remember that enurement clauses transmit whatever status they create. Naming individuals as beneficial shareholders, having them sign personally, and binding their heirs carried arbitration rights into the next generation.
• Read the governing agreement and the estate plan together. The power of attorney concentrated control in one grandson, but it could not remove the other’s party status, because that flowed from ownership rather than control.
• Do not paper around the problem. If party status is wrong, amend the agreement — an acknowledgment buried in a later letter of intent will not fix it and may carry no interpretive weight.
• A “final and binding, no appeal” clause does not insulate a jurisdictional ruling. Whether a person is a party to an arbitration agreement is a question of jurisdiction (Covanta Durham York Renewable Energy Limited Partnership v. Barton-Malow Canada, Inc., 2016 ONCA 558), and a s. 17(8) application is heard de novo (paras. 49–53).

The short version

An arbitration clause is only as narrow as the class of people it names. Where an agreement uses “party” loosely alongside carefully defined roles, the loose word will be given independent content — and a shareholder with no management rights may still compel arbitration.