The trio are heirs of the deceased and if they are living jointly without any partition of the property by mutual consent then all have equal rights to enjoy the property without disturbing the right of fellow heirs.
Any one of heirs don't have right to allow anyone to stay on property without the consent of fellow heirs, and also cannot allow anyone to stay for considerable long time without paying any consideration.
Although any heir can allow without the consent of fellow heirs, his/her relatives to live on that part of undivided property which he/she is currently using for himself/herself, but cannot allow without consent of fellow heirs, to live on common part of undivided property which is used by all heirs equally.
Non-beneficiaries/Non-heirs cannot restrict any kind of right of real-beneficiaries/heirs, they cannot even restrict ingress-egress to any part of property.
Because non-beneficiaries have not acquired any kind of right in property, they are allowed to live just because of good-faith of one of heirs, good-faith cannot be misused.
Family of heir can only include spouse, children.
If male heir, then his family includes his wife and children and have right to live on undivided property. A male heir cannot allow relatives of wife to use the undivided property without the consent of other heirs.
If female heir and is married, then her family includes her husband and children, although she also have equal share to that of male heirs but her first living place is her matrimonial home (husband's living place/property). But if she was allowed to live with her husband and children at the undivided property, then she cannot force her brothers to let her husband's relatives live on the undivided property.
