Dear Iam4freedom.
So sorry to hear you lost your mum. Looks like you're not going to get any support from your siblings. I don't know how things are organised legally where you live, but over here executors are usually notary publics. If I were you, I would hire the services of a good one and leave the settlement of the estate up to him/her. They are independant and should be a trustworthy party for each and everyone. It may cost something extra, but it will spare you SO much pain and trouble, for you are NEVER going to do this right according to your N. bros.
Good luck.
NeverAga1n
(I post at the general forum, Nsister, NXhusband and deceased Nfather.)