Happys backstory (need help)

i got this idea because someone ask me ''what is happy crying about?'' so i got an idea of making a comic-ish story and thought of what her parents personalitys would be and i came up with

mom: a cold woman who doesent expres her self but if she has something to say or comment on she mostlikely say someting uncaring or hurtful.(shes a glaceon because of her cold personality)

dad: hes a strict father  and can get angerd of the smallest off things but dosent show it so you never know when he is ready to explode or he is just hes normal uptight self (i made him an umbreon because of hes stern anger)

but my problem is what the plot shall be, how the parents interact with each other,  what to add to ther personalitys and  what happy is to them