My sister and I have always had a, shall we say, turbulent relationship. She is 3 years younger but is quite young for her age iyswim. She is very self absorbed and very ungrateful. We have fallen out several times but have always ended up speaking again.
A couple of months ago we had quite a bad arguement. She said some very hurtful things to me, very personal things. She just doesn't accept that the things she says are hurtful. She beleives that she can say what she likes as it just "washes over me" but I should be very careful what I say to her as she is "sensitive". To a point this is true but the things she said were really hurtful and insulting. For the first time ever, she made me cry. (When I got off the phone- would never let her know this.)
I have gone out of my way for her numerous times. For example when she had an arguement with my parents, I dropped everything to go and pick her up and had her to stay with me until things were sorted out. I got no thanks for this and no acknowledgement that in doing this I risked my relationship with my mum, as she felt sis should have stayed and faced up to the consequences of the arguement.
Anyway, getting to the point, she is no longer welcome in my house due to the things she said. When she got back from uni last week I took my dc round to see her. I sat in the front room while she played with them. We hardly spoke. This wkend my parents are away so she is on her own. She has recently split up with her bf who she would normally be with. She has just phoned me to ask me to take the dc round to see her. I said no as we have plans for today and tomorrow. I now feel really guilty that she will spend the whole wkend alone and miserable. I also feel angry at myself for caring as I swore to myself I would not let myself get emotionally involved with her again. I just can't shake the feeling I should shift our plans around a bit to take the dc over there....
What should I do?