Loans between brothers and sisters are loans between equals — no parental authority to fall back on, and a lifetime of family dinners ahead. A sibling loan agreement keeps the deal business-like so the relationship never has to enforce it.
For context: a lawyer bills $450+ for the same one-page reality. Building it here is free; certifying and double-signing is a single $29.
A parent lending to a child carries quiet authority; a sibling loan has none. It’s two adults with equal standing, shared history, and — crucially — shared parents who will hear about it if things sour. That’s the real risk of the undocumented sibling loan: it doesn’t stay between two people. It becomes the family’s problem, argued over holiday tables and relitigated through Mom.
Putting the terms in writing removes the need for a referee. The schedule answers questions before they’re asked; neither of you has to nag, remember, or interpret.
Answer plain questions — who, how much, the schedule, interest or none — and Lend Right assembles a province-correct agreement you both e-sign from your phones. Drafting costs nothing; a single $29 fee, the borrower’s by default, locks the PDF with a certificate recording both signatures. Cheaper than one awkward Sunday dinner, and considerably cheaper than the $450+ a lawyer would charge.
Terms on paper, both signatures on your phones, done in minutes.
Create my loan agreement →Yes — siblings are ordinary contracting parties. The practical problem is proof: without a signed document, a defaulting sibling can recharacterize the transfer as a gift or 'family help,' and you're left proving a conversation.
Anything from zero up to (but not including) an effective 35% APR, the federal criminal ceiling. Between siblings, zero or the CRA prescribed rate (3% for 2026) are the common picks — what matters most is writing down whichever you choose.
A written agreement gives you options that don't require a family summit: a reminder referencing the schedule, a renegotiated timeline in writing, and — as a last resort — small claims court, where your signed agreement is the core evidence.
The dollar figure isn't the point; the recurring pattern is. Documenting even a modest loan sets the precedent that money between you gets written down — which makes the next, larger ask easier for both sides to handle well.
Operator: RULE8 Inc. (Lend Right is a RULE8 Inc. product). Reviewed July 3, 2026 — Lend Right Editorial Team.
Legal footing: federal 35% APR cap (Criminal Code s. 347); each province’s limitation act and e-commerce legislation; CRA prescribed rate (3%, 2026).
Limits of this page: document automation only — general information, never legal or tax advice, and Quebec isn’t supported yet. A secured loan, a business loan, or anything entangled with a divorce or estate belongs with a lawyer.
Signatures: e-signing is recognized across supported provinces for contracts like this one; the sealed PDF’s certificate shows who signed and exactly when. Enforceability ultimately turns on the loan’s facts, with the document as the evidence.
Lend Right provides self-help document automation, not legal advice, and no lawyer-client relationship is created. For complex situations, consult a licensed lawyer in your province.