Haven't read this one but apparently the MC reincarnated as a butler for the Zoldyck family.. so I guess that counts as assassination family? I don't think there's many novels where the mcs family is all assassins tbh.. Anyway, Link
Oh yes I did read this one but as I remember he was a disciple of some mage not from an assassin family
Not a webnovel (its manga) but maybe check out spy x family? The family a all have their own skills (Dad is a spy, mom is an assassin, daughter can read minds, and the dog can see the future) The dad and mom are basically in a contract marriage so it's not really a romance, & the kid is adopted. It switches pov so you get a nice dose of espionage and assassin. It is kinda slice-of-life sometimes. Might not be exactly what you're looking for.
Well he was an assassin in his last life but still use his skills in his new life Mc is quite a sly person But I read this long ago so I don't remember very well In fact there is not a lot novel in this style Except in webnove there was a bunch of brain dead novel about a moron who suddenly got an assassin power
Yes it's a hard find but worth the wait. I just love this assassin family setting I just wish there were more of them aigh~ Only seen three so far
i dont if you already read this or if someone has already mentioned this buthttps://www.novelupdates.com/series/i-played-the-role-of-the-adopted-daughter-too-well/
https://www.novelupdates.com/series/the-best-assassin-incarnated-into-a-different-worlds-aristocrat/ ? I've only read a few chapters of the manga. It has harem though
I really like Pigpen and Bastard which both fit into this (and they were illustrated by the same person who illustrated Home Sweet Home and Shotgun Boy to narrow it down). They're thrillers, in Pigpen the protagonist was adopted into the family which was shown later on.
No idea about Pigpen but in Bastard mc wasn't from an assassin family his dad at best could be called a serial killer
Yes dear but it was meant killer as a professional killer who kills for money not a random dude who kills for pleasure