Your question raises some interesting issues regarding adoption and single parenting. Scripture doesn't directly address this issue so we must be careful not to add to Scripture or subtract from it. Children will be cared for in a responsible way. God gave laws and governance to that relationship in the Fourth Commandment. Again, fathers and mothers are both mentioned.
Fathers have specific responsibilities and are given specific advice.
The example of a good and caring mother is praised. Blessings are promised to those who listen and heed the instruction of the father and the teaching of the mother. The fact that both are mentioned here has no bearing on the answer to your question. It is just that blessings come from both of them and from each of them individually. In the time of the Old Testament many women were younger than the men to whom they married.