I also have one child...and he is very used to communicating on a very adult level. He is very emotionally mature for his age as a result of being an only child. He turned 11 yesterday.
And during the past weeks, I have been conversing with him about my love coming to stay with us, and that at some point in time that may actually mean he may need to share his bedroom with my love's son.
I asked my son how he may feel about sharing his space and room.
"Well, it's not my ideal mum...but of course I will work it out, I can see this is important and special"
And it reminds me to never underestimate children.
I once asked my son "who is you best friend?" He listed 3 children...and followed it up with "Best does not mean one mum...they are all best"
Children have special powers !