Traveling with kids

I promised a niece I'll take to her to England. So we are leaving end of August for London. We were to stay with my aunt Lili but I just heard from her, her 50 year old son just broke up with his girlfriend and has moved back home. That's my cousin. I was also to visit his sister in Sussex but that is out also because she and her american husband and children will be in New York and Cape Cod during the time we'll be in England. I called Auntie Mary, my backup place to crash in London. She has been feeling poorly lately and might go to France with her daughter, my cousin, Beci. So I called Beci to see what her actual plans are. If she's going to France, we can take the train from London and be in France too. Cousin Beci just bought a house with a friend in Brittany. I don't mind going there to see it. I've never been in Brittany. Also I'm waiting for news to see if we can crash with cousin Sheena when we visit Amsterdam. At this moment everything's up in the air which is an anomaly with me. All my vacations are planned to the last detail but not this one. It's kind of fun actually. I know when we'll leave for London and when we'll come back. Not what we'll do while there. We'll find something to do.