Your sister and father are conditioned to appease your mother no matter what. You are meant to be the family scapegoat, and they will try to make sure that you stay in that role, because if you don't, someone else might have to take the fall.
So ignore what they say - her words are not "the truth", they are her version of what she sees with a very negative filter and take no account of anyone else's situation, feelings or anything else.
Take your opening post - you had a migraine.
I suffer from horrific migraines, she seems to get very annoyed with me when I have one.
It is not your fault you get migraines. She "gets annoyed with you" because she doesn't understand why you get them, she probably doesn't get them so doesn't understand how debilitating they are. That doesn't make your migraines annoying to everyone else, only to wankers with no empathy.
Anyway, I agreed to look after my young nephew this afternoon and she said she'd come with me for the first couple of hours to help, because I felt so ill from a migraine today. (Didn't want to let my sister down)
So she came with you to help because you were so anxious to not let your sister down - a caring mother at this point would have said "go home to bed, I'll look after DGS" - because she was there anyway. But no.
It kept getting worse, I have severe nausea with them, and she was getting more angry towards me the more ill I felt. She said some horrible things:
Because she was frustrated that she was doing more work than she wanted to? Because you were ill with something she doesn't understand? Because why? WHY get angry with a sick child??!
"YOU want to work with children? The state of you?" You had a migraine, you were unwell. This does not make you incompetent or permanently ill.
"You've spoilt today now by being like this" HOW? She wasn't even supposed to be there initially!!
"You're mental" There is no validity to this statement at all - filter or no filter, it's a lie.
"You're actually a nightmare to be around" - she might feel that way about you but that's her problem - you're not a nightmare yourself, and actually it says more about her inability to cope with your illness than about you.
"I wont ever arrange anything with you again as you cant be reliable" Bollocks - you were ILL.
"You do realise you'll never work with children because of the way you are?" What, ill? stupid stupid stupid and wrong.
I started crying and she got even more angry! I had to leave, felt my head was going to explode. I've let my nephew down but wasn't in a fit state to care for him. The head pain has eased a bit now I've taken painkillers but still feel so sick. NO - you haven't let your DN down. YOu tried your hardest despite being ILL.
I've really had enough of her, she picks on me every time I see her, she doesn't like my son and he refuses to speak to her now. It felt like she kicked me where it would hurt, its my dream to work with children and I have bad depression and anxiety at the moment so her comments crushed me. And didn't she know it. So she thought she'd put the boot in to someone already down and unwell - peachy behaviour! That's not "no filter harsh truth", that's mean, spiteful, vindictive bitch behaviour.
As I said - your sister and father have their own vested interest to keeping you where you are now - they are as bad as your mother for failing to check her appalling behaviour towards you, just letting you take all the flak, out of self-preservation.
Any good reason to stay in touch with them either?