To go or not to go

Adrian's first proper paper has been accepted to appear in a conference in Portugal and he has asked me to go with him in August. He's suggested asking his mum to look after the girls while both of us go but she's not sure if she can cope with 2. So the plan now is to bring Lavigne along with us and Louisa will stay behind with her grandmother. However, I don't feel good leaving her behind. She's very attached to her father and if she doesn't go with us, she'll definitely feel totally left out and be very upset about it. But if we bring her along, I'm not sure if I can cope and her airfare costs more than 200pounds which is a lot. Lavigne is still an infant and her air ticket will only cost about 2opounds. We'll be away for 6 days and I am already feeling guilty towards Louisa even though I've not decided to go yet.

In fact, Lavigne and I were to go to Edinburgh with Adrian last Wednesday for another conference. We planned to let my parents look after Louisa since they were here and we were meant to be away for only a night. However, the plan fell through. It wasn't worth paying 100+pounds for the airfare and stay for only a night. Moreover, we would have to arrange for another person to look after Louisa as my parents were flying off to Italy the following morning.

Once again, should I place my own needs before Louisa's?