Drop the lot of them, OP. People like this are not worth your time, and if they truly believe such hideous things about you they are not friends, and its best that you know this from the outset.
I've been in a fairly similar position. In my case, I'd reported a creepy colleague for sexually harrassing me over a period of months. My employers found in my favour and he was dismissed. When the grievance process was eventually fulfilled, I was given the opportunity to read statements from some colleagues in my department. Two had witnessed odd things themselves and supported me. The other two - both of whom I'd previously respected and liked - did a number on me with a fullscale character assassination in support of creepy colleague - they'd worked with him for aeons and not seen anything amiss - with strong implications that I must be lying.
As events transpired, of course he'd done it before; even been reported before, but the management of the time ignored the women's concerns and brushed the whole thing under the carpet.
As for the two whose statements I read, I now keep at the periphery of my department and if I met them outside work they are people I'd cross the street in front of a speeding bus to avoid. If they want to side with a sex pest against the victim he abused, I will not give them one second more of my time. They get a frosty 'hello' and that is all.
I hope you can move on from every one of those awful people, OP. Let them see that whilst they might not value you, you value yourself.
So sorry about the loss of your mum 