Legal property issue. My mother in law’s’s father died without passing on the property to anyone.?

So legally my mother-in-law and her brother owns the property. Now, if my mother-in-law does not give the property rights to her brother and dies before that, then the property will be transferred to my husband. My question is, will I or my daughter have any right in the same? Can my mother-in-law’s brother pass it on or sell it without our consent? To sell it off, who’s signature is required?

This is urgent and very important. pls help