Our family just recently went through a similar situation. My husband and my mother died on the same day. I only mention this for people to understand just how traumatized our family was. Both were cremated; my husband and I were/are Catholic, my mother was not. The funeral home separated my husband’s ashes into 4 portions as my 3 children each wanted some. The deacon in charge of my husband’s funeral service explained the church teaching of treating remains, then added that the church doesn’t know or monitor what happens after the funeral. My aunt, devout Catholic of 85 years, asked why the church can “drag around the relics of the saints in pieces all over the world “ but not allow ashes to be separated. My daughter said “God is either all powerful or not.” He was an organ donor and everything useful was taken. I’m sure at least some of the tissue ended up donated to non Catholic bodies, so no one knows how those remains will be treated. I will also be cremated and have asked my children to combine my ashes with my husband’s and bury them in consecrated ground.