I want to make a tiefling warlock where their pact magic is based on a demonic well meaning but over bearing grandmother. and I want it to be on the character sheet on here buuuut idk what kinda homebrew creation category that would be under. Does anyone know?

So, the start is the patron itself can be almost anything you can work out with your DM.  Did you want it to have the abilities of the Demon pact with fire and extra damage spells, A succubus could be something that might be appropriate.  Perhaps it sees you as a child in learning seduction, a new addition to the harem/family like a matronly house of ill repute.  I personaly like the idea of the whore house isn't always some awful place run by domineering men, sometimes a determined woman gathers all these abused prostitutes and takes care of them as much as possible (think free day care while they work).  The other side could be something like a Fury or Erinyes that maybe she is cultivating your personal empowerment to create a new power to help her fulfill her goals of punishing certain people.

Another side to look at would be a Fey pact with say an ancient Hag, she may be violent when needed but dotes upon her surrogate children.  Perhaps she has long term goals of converting you to a Hag and bring you into the sisterhood of hags.

For Undying Pact the Raven Queen although somewhat aloof may have taken a particular interest in your character and encourages her to not fear death, death is natural death comes for all.  You my daughter are not yet ready for death but in time perhaps you will be and can join the cycle of life.  It could be a somewhat creepy love that might even make you uncomfortable in its closeness.  I mean how weird would it be for any of these to have them invite you to tea, be doting on you asking about your significant other and then in the next moment be brutally murdering someone and telling you don't worry they deserved it.  Almost like a reversal of gangster movies, the juxtaposition of humanity and a monster making it that much more unusual.

hmm well like it's literally her demon grandmother, it's not so much creating the pact in a role play sense as how do I put this on the character sheet? cause there is only an option for the Fiend as her patron, but i dont see where you can make a patron for warlocks in the homebrew menus on here.

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hmm well like it's literally her demon grandmother, it's not so much creating the pact in a role play sense as how do I put this on the character sheet? cause there is only an option for the Fiend as her patron, but i dont see where you can make a patron for warlocks in the homebrew menus on here.

I havent figured out much about her grandma yet only cause this character is a test of how the site works and is also a backup character for if I need a new character for whatever reason. but seeing that my DM is my boyfriend and he likes the basics of it when I was talking with him it should be fine. 

Essentially her grandma has always offered her powers to use to her benefit since "I just worry about you sweetie, when your father let you live in the human world with your mother I let it be since you looked so... mundane as a child but then when your demonic blood kicked in oh! You know how humans are when they see horns and a tail!" where Bliss responds with "I'm fine grandma really thank you for the eldritch blast but really I'm fine." 

and like I'm liking the idea of everytime she levels up her grandma shows up to give her a new spell.

Hahahaha very nice.