Arianna was possibly the muggle boy’s that tormented her…Albus and Aberforth when Ariana is killed or the duel between the 2 of them and Grindlewald Kendra was possibly her daughter’s condition worsening and Percival’s is also Ariannna being bullied by those same muggle boys

You're posting many times in a row- I'd recommend not posting for a while after posting 3 times in a row.

Aberforth's might be people finding out what he did with those goats /j

Ariana

Prob those boys who scarred her mentally

Aberforth and Albus

Most likely Ariana's corpse, prob

Percival

Uh maybe his family dying

Kendra

Same as Percival

Just helping to answer questions mate, and also nice job.

I think they meant the person who made the post, not you

(I've edited this post to Fan Theories as the questions don't have a canonical answer- please be mindful of the categories)