YTA. First, for not telling your brother that your father had passed. I understand the reasoning behind that decision, but learning about it during or after the honeymoon ruins the memory just as much either way. And I can promise he'll feel guilty for having been enjoying his vacation instead of grieving his loss.
Second, for having the funeral without him (!!). Everyone should get the chance to say goodbye to their loved ones and you robbed him of that opportunity. That is the part of the story that makes you a HUGE asshole.
Well, that and disregarding his feelings and surprise when you told him your father had died because "he should have known". Come on.
YTA 10000% no debate