What Legal Rights Does The Mother Of My Son’s Child Have? (Spanish rights)

Okay, some silly family skirmishes to deal with here.
My son’s girlfriend became pregnant and recently gave birth to a baby girl.
To cut a long story short they have problems with their relationship and she recently threatened us with legal action ("I will call the police") if my son doesn't help her to take care of the child when she goes back to work (in October) But he has already told her that he WILL help her with the child. We were going to let her live (freely without rent) in a 3 bedroom flat we own nearby but her attitude has made us put this on hold and she has become even more aggressive. So now we have told her to find a small flat and we (the grandparents) will help her with half the rent. She thinks its likely she could lose her job if my son turns up late to look after the child (and since her job is a simple supermarket job this is a legitimate worry) my son (26) doesn't work and has some other problems (that we don't need to go into just now)
Basically we need to know what the law requires of him generally in these circumstances, and what the law may require of him should she lose her job for any reason. I suppose there is social welfare for mothers with young children?. And any other information that might be useful to know about cases like these (all too common most probably)

Ask a solicitor.

One of the problems of people with problems is they don't know they have a problem

Carlyyound:

Depending on your son´s financial possibilities , Law will require a different amount as child´s support