Answer
(Fatwa: 1597/1597/M=1431)
(1) If all the heirs are mature and each one gives his or her shares to you happily then you can register the whole house in your name otherwise not.
(2) Whatever capital amount your husband deposited, it became inheritance after his death and each heir has right in the inheritance. Hence, if all the heirs are mature and they allow happily the amount to be spent in isal-e-sawab of the deceased, then you can do so, otherwise you can only give in charity the amount of your share. And give the amount of interest in charity to poor and needy ones without the intention of reward. No isal-e-sawab is valid with it.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband