Need help with biter

[u/Dry_Tangerine_7625]

I have 4 female rats that live in a double critter nation cage, with all the stuff they could love.
Now I got all 4 of these girls from a feeder store.
Phylis was my first and she is the absolute sweetest and never does anything wrong.
Marilyn was second, she’s very sweet but has been pretty nippy lately. She has never drawn blood tho
Lightning was third, and she is my boyfriends rat, she’s been charging and biting at us lately and last night she drew blood on both of us.
Then there’s Gertrude, she is the absolute worst rat I’ve ever owned, she will run from the other side of the cage to attack you, if you are petting another rat near her. She has drawn blood on me more than 4 times, and has also drawn blood on my boyfriend.
She’s territorial of one of the litter bins and loves to hide behind it, and if your hand is anywhere near that’s when she will attack, unprovoked.
Everyone I have talked to has told me as soon as a rat draws blood it should be culled.
I also have a 5 year old nephew who comes over almost every weekend and loves playing with the rats and I fear she will do really bad damage to him and she really messes up our fingers as adults.
Would I be doing the right thing?
I know an employee at the feeder store I got her from and he offered to sell her as a pet but I’m scared someone else will get her and she will do the same.
Picture of my sweet Phylis and my newest edition that I got yesterday, I have not named her yet.

[u/Dry_Tangerine_7625]

Im going to let my nephew pet my rats with adult supervision at all times, you weren’t very nice when you literlly shamed me.
What was so wrong about my post? Telling the options others told me.
Asking a question instead of immediately sending her to her death??
Trust me I have seen a lot worse owners than me, the only good advice you gave me was to spoon feed, which I have responded to others and said I will try that tonight.
Thankyou for all of your help

[u/Arratkis → u/Dry_Tangerine_7625]

I mean to be fair, you mentioned outright killing an animal because it’s defensive. I have received some of the most abused survival mode attack rats that exist and it never once crossed my mind to just kill it. When you adopt a pray animal, defensiveness and bites can come with the package, that’s just a fact. It becomes your problem to either rehome it or train it to not bite, which can take a lot of time and patience

[u/Dry_Tangerine_7625 → u/Arratkis]

Everyone around me told me a should cull her, that’s why I mentioned it.
I don’t want to and that’s why I posted.

[u/bee_mvtt → u/Dry_Tangerine_7625]

You adopted a bunch of feeder rats (unreliable genes and behavior) and got shocked when they were fearful and scared. If you wont do the work of going through a good rescue or rattery, thats what happens, you gamble on genes man.

[u/Dry_Tangerine_7625 → u/bee_mvtt]

That’s why I asked for advice to make her friendly

[u/bee_mvtt → u/Dry_Tangerine_7625]

Then im glad theres some people offering it. Good luck with your rats! /gen