Looking for series/author I've forgotten

[Stardrgn77]

I can't believe I've forgotten this series name, and even which author it was! 

The most distinct notes I can describe are...

Not paranormal.

Set in modern day, average folks.

Is a series set around a family but not all siblings I don't think.

Hilarious rich old grandmother? who rides around in a limo that in one book ends up painted for a pride parade (penis-like maybe), i think her mansion ends up with a rainbow on front... maybe, if I'm not mixing her with another fabulously supportive older relative lol. 

 

She very much reminds me of Aunt Tilly in Lucy Lennox's Marian books,  only without Granny and Irene.

 

I read so much I know I'm mixing up the MCs in my head so I can't describe them,  but I'd very much like to reread these and can't figure out which ones they are!

 

Any help is appreciated.