Contributed amounts to buy a house

A house is bought using mother’s money, mother’s sister and brothers’ money, other son’s money and a major share by son 1. property value is 4000000. son 1 gave around 2200000. The rest was arranged by other mentioned members. Renovation amount is not included. Whose property will it truely be? mother says it is son 1’s house. he should pay Zakaat and he owns the house.