Answer:
(Fatwa: 770/745=D/1429)
How was the dealing made? There was selling and purchasing i.e. the sisters sold their shares to their one sister on payment of considerable amount, then the sister who purchased will own the land, she can construct a mosque on the land and salah performed therein will be valid. However, the sister must pay the amount to her sisters; delaying payment for no reason is sin.
However, if the dealing was made another way, then you should clarify it and ask the question again.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
