i hope i dont get slated here BUT.... sometimes in life sweets we have to be selfish, even with families! my heart goes out to you and your mum with your sisters ill health... BUT you to NEED this op for your health to, otherwise you wouldnt be having the op, maybe im abit harder im not sure, but the waiting lists with sunderland, and the constant cancellations of appointments 'you only need to read through old posts on here' i really would think very long and hard about cancelling this appointment....my advice to you is to GO to this appointment, then thats out the way you then have the 6 months clear before your op so you can attend any hospital appointments give support whatvever it may be, and still have managed to sort your self out to, you ve put in all that hard work to with the weightloss! imagine regaining and then going to the third op in aug and not getting on the list as you ve had to wait, and havent managed to maintain....your sister has the most important person there her mum... and while i know your mum has alot on her plate with your sister, your her daughter to, who very much needs an op, for your health, for your life! sometimes we just have to be selfish and say no, other wise nothing would ever get done in life...
i wish you well sweets xx