Sans AU: The CQ Family Issues

In this AU,404 and Bill used to be enemies.

After 404's husband; Wrath,dies by the hands Infected,404 got deppressed since he's a single father with 5 kids.

Era and Error are twins and Era is the oldest and they are both 10. Error is very overprotective to Era and sometimes clinged on his twin but still cared on his other siblings while Era is a gentle and sweet boy with a calming aura and the only one who can controlled Error's emotions if Error lost control on himself.

Geno is the middle child. He is 8 and he is very shy and quiet and sometimes hide behind 404's back since he's scared on strangers.

Fresh is the 2nd youngest and he is adopted. Wrath is the one who found him and decide to adopt Fresh and his family doesn't care if he's an parasite. He is 6 years old.

Then we have CORE! Yes ya heard me,THE
Core!Frisk and she is 3 years old. 404 found her since her parents left her and she is an semi-monster.

But when Wrath died,nothing is the same. 404 is planing to avenged his husband's death but him and his kids have family issues and that they are clearly not the same anymore.

But what happened if Bill helped them? And what if he never hate 404 nor sees him as a rival/enemy? What happened if 404 found out?