Buying With a Friend, a Sibling, or a Parent

What usually happens without a written plan

Co-owning a home with anyone — friend, sibling, or parent — creates the same joint liability issues as co-signing (see our co-signer guide) plus a whole additional layer of decisions that a married couple's default legal assumptions don't automatically cover for non-spousal co-owners. Without something in writing, disagreements about selling, one person wanting out early, unequal contributions, or one owner missing their share of a payment have no pre-agreed resolution — they just become a dispute at the worst possible time.

What a co-ownership agreement should actually cover

• Ownership split — equal, or proportional to each person's down payment and ongoing contribution
• What happens if one owner wants to sell and the other doesn't — a buyout mechanism, a forced sale process, or a right of first refusal
• What happens if one owner misses their share of a payment — since the lender doesn't care whose fault it is, only that the full payment arrives
• How major decisions get made — renovations, refinancing, or renting out a room, if only one owner wants to
• An exit timeline or trigger — especially relevant for a parent helping a child buy, where the parent may want a plan to eventually be removed from title or the mortgage

Who to ask

Have a real estate lawyer draft a proper co-ownership agreement before you close — this is a genuinely different document from the mortgage and purchase paperwork, and it's the one that actually protects the relationship as much as the investment. Decide with your co-owner, in writing, how title will be held (joint tenancy vs. tenants in common carry different legal implications, particularly around what happens if an owner dies) — ask your lawyer to explain the difference for your specific situation.

Model each owner's share of the payment on the mortgage payment calculator before you finalize the split.

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