Can someone explain PIP to me & why children with learning problems get loads

[Toocleverbyhalf2]

I'm disabled and unable to work any more because of health problems. I receive PIP at £220 a month, which is almost solely spent in my needs: running my car & paying privately to a therapist for my mental health problems ( a years wait on the NHS) and physio for my physical problems. I'm not moaning, I'm grateful I can do these things and it makes my life a bit easier.
However, my niece has two school age daughters & claims PIP for both of them: one has severe asthma & the other has ADHD. She receives nearly £1000 a month and I can't see where that money goes to be honest. They are spoilt rotten with toys, all year round, but apart from that I can't see why she needs the money. Can someone enlighten me?
I'm not judging, just curious

I am not 100% sure what my dsis gets for dniece. She has spent some of it on car parking for the hospital. To make up her dps wages when he can't work because dn is in hospital again. It will pay for a seizure mat for dn so she can her own bed rather than sleeping between my dsis and her dp. That's when they finally get a house with a room big enough for a double bed and a single bed in together as dsis can't leave her alone overnight. It pays for her son to have some talking therapies after he started showing symptoms of ptsd after watching his sister have multiple life threatening seizures. It pays for days out fir them as a family to try and give all of them positive memories of their childhood. It keeps a car on the road for dsis to take her to multiple hospital appointments and also buys basic shit like food and gas and electricity when they are short of cash. Because dsis can't work. In fact although dniece is now at ft school they won't administer emergency meds to dniece so sister can't go far incase she is needed at school. Oh and occasionally dniece and her brothers are spoilt and bought toys.

Hope that helps.

Thankyou.