My mother passed away leaving life insurance policys.

my mother passed away leaving at least 1, possibly 2 life insuranse policys. i have 18 yr old twin sisters. at least 1 of the policys were through my fathers job. It was this one for 100000.00 that the funeral and burial cost came out of up front. 22000.00 had to be paid up front before services, leaving a large amount left over. we also have reason to believe she also had a personal one for possibily the same amount, maybe a little more. At the time of her death she had 2 grand children that meant the world to her. Our father was extremely abusive growing up. Now with mom gone, the relationship with him now is strained to say the lease. as of current none of her children or grand children have recieved a dollar. My father collected all of the moneys from any and all policys. There was no will that he will admit to. But without a doubt if there is one on file from her, it would have included the children and more than likely the grand children as well. Directly after collecting the moneys he purchased property for 66000.00 cash that we know of. What are our rights as her children. and where do we go from here. Do we have any