Moved in with my partner last month. DC is now an adult (just) and has moved in with a friend in the city, I live 40 minutes away in the country.
DP has a mid teen daughter who stays twice a week. All good there and everyone gets on well so far.
2 weeks ago my DC came to stay, same night as DPs DC stays regularly. Again all good, we got a takeaway and everything was great.
My DC is coming again to stay this weekend at my request, again same night as DPs DC due to logistics of my DCs job. My DC has asked if they and I can go for lunch together just us before meeting up with partner and their DC to go to a shopping centre as already arranged. Fine with me, always nice to have 1 on 1 time with my DC.
DP has objected, states I've already spent plenty time with my DC this past week (which is true, we went to an event together and I stayed overnight with DC) and we should spend time as a 4, it's not very thoughtful to him and his DC and how will he explain to his DC that they just aren't invited.
My opinion is while I have spent plenty time with my DC this week that we should be able to do things separately, it's important he still has 1 on 1 time with his DC and due to my DCs job this night is the only night they can ever stay and if I avoid 1 on 1 things because his DC is there then I'll never get to do them.
Additional information, DP has been awesome, really stepped up and helped me this week when I had a lot on, looked after things at home so I could do all lot this week and has been great overall. Other information is that myself and my DC are exceptionally close, I miss them a lot and we would always have a breakfast or a lunch or something this particular weekend of the month (payday) as a long standing tradition.
So AIBU to think it's okay to go to lunch with just my DC and meet back up with DP and his DC after for other activities?