Same here, one set spend a week at a time with their other grandparent, now they are at school she visits often and does the daily routine. We babysit (tend to get tired and ratty children!) and do some school pickups which are 'our time' and occasional school holiday days which are fun. Their weekends are packed so we rarely see children or adults then. Rarely have a day out together whereas the other family do as their week or weekend is viewed as a holiday It was difficult early days but now the children are older a relationship has formed and it feels fine, they love us all but expect different things with different people. . The other situation is very different, daughter in law's extended family do all the regular childcare to support their work patterns, so the attachment is strong. We visit regularly for a few hours and do some stand in childcare but when we are all together it's obvious where the stronger attachment lies. It's understandable. The little one is safe and well cared for, can't ask for more and you know, we really couldn't provide regular child care, too exhausting. The other family is much younger than we are! Perhaps helps to think that when there is a difference in instinctive relationship it is just that, different, not better or worse.
Feeling uneasy with tradespeople in the house.