Caring and PIP

Biffy

Hi looking for advice regarding being on low rate pip myself have been working as was deemed fit and did 20 hours
Unfortunately have had too give up work due too circumstances outwith my control my father geddit 81 partner passed away on the 19th Jan 
Due too his care requirements was decided as a family that dad needed constant care I am too move into his home which has stair lift and wet room and also 2 bedrooms with the continued support of my daughters and other family member for cooking food and cleaning so will be a shared care situation as I need help and support myself 
My brother on  checking has stated that carers allowance can be claimed. ? 
ALSO he on checking dad's dla that only low care is paid 
Dad has too be helped dress fed toilet needs also walking his partner  for whatever reason decided not to claim more did pop into citizen advice a month for app any advice would be helpfully 
Also dad has just received notification that he is too be changed too pip