First time post but long term lurker.
Background - DH's family live 2.5hrs away in the town in which he grew up. His best friend since school still lives in the same town. Whenever we visit DH's family we try to fit in a catch up/visit with his friend. Friend (let's call him John) is married to 'Jane' and they have one DD (9) 'Emma'. We have 3 primary aged DC, youngest is DD (6). In the last couple of years our visits to them have increased in length and frequency, partly because our children are older (DH's family tended to visit us more when DC were babies and toddlers as easier for us due to distance, then Covid obviously stopped visits for a while) and Jane and I now organise the visits as DH and his friend would leave it all to the last minute and then it wasn't always possible to see them.
Our visits have increased from just going round to their house for a few hours, to days out, overnight visits and more recently 2 night stay. My DD loves going to visit Emma - loves being friends with an older girl, loves her bedroom which is like Aladdin's cave to my DD. My oldest DC doesn't like to visit, mostly because he's an older boy, finds Emma annoying etc. Middle DC isn't fussed either way. DH, while he likes to see his friend, would prefer shorter visits as he would rather spend more time with his family.
Jane and John are very generous and welcoming hosts. DH and I have sensed that the intensity of the visits has increased mostly due to Jane's insistence which we think is because of her DD. Emma is a very bright and confident child but, by Jane's own admission, she is hard work, 'in your face' and intense. It seems that she has difficulty making or maintaining any friendships. Jane says that playdates have always been a disaster so she now avoids having any. So we think Jane likes having us visit because we have similar age kids who mostly get on well with Emma.
Unfortunately when we visited recently an incident occurred which really concerned me. Oldest DC came running downstairs to tell us that Emma was taking photos on her ipad of DD in her underwear - for a dare. I rushed upstairs, as did John, to deal with it. John spoke to Emma while I dealt with my DD .My DD looked terrified, thinking she was in big trouble for what she did. Emma started crying about something else to distract John from the main problem, something we have noticed she has done before. Obviously we checked that the photos were deleted and John and Jane reassured us that Emma couldn't send them to anyone as she can only message the two of them, doesn't have social media etc, but they didn't seem overly concerned that their child had been encouraging another child to strip off and take pictures of her.
Since then, oldest DC has told us about other things that Emma says or does while they are there, which are inappropriate. I don't think that I dealt with the situation as well as I could have, it all happened so quickly and looking back I wonder if I could have done anything differently.
Also feeling awkward about future visits as we don't want our DC, especially DD, to spend so much time with Emma,but don't want to affect the friendship we have with John and Jane. So, more of WWYD rather than AIBU?