two individuals living together in one party's property, but sharing all expenses via joint checking account for 10 yrs with intent and oral agreement to purchase another property to serve as jointly owned home. First property was refinanced with both parties names as joint tenancy. (IRS rules qualifies as a gift of half) and both names were placed on the deed. Equity in first was used to purchase second home, again with both parties names on joint tenant mortgage. after break of relationship, first party states there was never any intention to share or gift property, the purchase was made from solely owned refinanced property and Mass State law is one of contribution. Doesn't purchased property under Joint Tenancy (instead of Co-Tenant) preclude any and all other and state equal share?