Yes I have a family member whose child was stolen by her own mother. The mum was in her early 20s, married, with an admin job in the NHS. She had a minor physical disability but no learning difficulties, addictions or mental health problems.
Her husband also held down a job , although he was a big dim TBH . Her her parents hated him because he was from a lower social class and they didn’t think he was good enough for their DD.
The mum had some health issues during the pregnancy and her mother suggested she stay with her parents so they could “look after her “. They then started to alienate the mum from her husband.
She had a difficult birth so continued to stay with them to recover. The GM chose the name for the baby and did everything for him.
The young mum was lazy and a bit spoilt so was happy to let her mum do everything. The GM made it hard for the dad to visit, said baby was sleeping , undermined him at every turn. Every time the dad held/ changed / played with the baby, they criticised him and of course he lost confidence .
The dad wasn’t the brightest and couldn’t really see what was happening. Every time he made the slightest complaint, his in-laws bought him off with some renovation to the house, a new car , promise of a fancy holiday next year etc.
He was a bit gullible and greedy but not a bad person - also he though he was doing the best for his son ( getting their house done up etc ). Like a lot of men he was happy to come in from work, eat a carry out and sit gaming for a few hours before popping down to see his wife and child. It was an easy life for him.
Eventually the couple split up , there was a long hostile battle over the FMH and custody of the child. The GP funded the mother through the courts but the father couldn’t afford to keep battling. He lost all contact with the child.
Then the GP started to alienate the son from the mother. Mother eventually moved back into FMH and child ( by then about 4-5 year old IIRC ) stayed with GP.
They sent the GS to a private school , went on expensive holidays, all the things that his mother ( single mum in admin type job ) couldn’t afford. She continued to see the child but he lived with the GP.
The GS reconciled with his mother in his late teens / early 20s but only moved back in with her when the GP died and left him all their money ( about £300k).
The young man is a very screwed up person now. He and his mother live on different continents. Her has never held down a steady job or had a stable relationship with a partner. He is very very obese and has a lot of physical health problems now he’s in his 30s.