Each to their own. My sister and BIL have a similar arrangement with my folks. My nephew will go to my parents place every Friday after daycare. He will usually go home Saturday afternoon/evening. Sometimes he'll stay til Sunday if my sister has to work Saturday afternoon/night. It works for them. Doesn't mean my sister and BIL love him any less. My folks love having my nephew there every weekend and my nephew loves spending time with them. Grandad is basically his favourite person in the world. (Some days I reckon Grandad even trumps mum and dad!) FWIW Nephew will soon be 4 and this has been their arrangement for just over 2 years.