First being twins wasn't exactly what Gibbs excepted when his ex girlfriend had called him and said she was dropping off their kid and not kids.
But either way he loves them both unconditionally.
Tony, Tim, Ziva, and Abby were like their siblings.
The fact that Jenny was the closest they had to a mom and that they both had a great time telling everyone they knew that they were dating. So when Sec Nav found out he wasn't that surprised. He cared less then what Gibbs thought he would but oh well but anyways.
Avery had blond hair while Nikki has brown they both have freckles and blue eyes. Shorter and skinnier than the rest of people that were 12 their personalities are similar
Avery would rather sit and draw or read.
While Nikki wanted to be outside kicking her soccer ball around.
But despite their hobby differences they both had the same attitude and sassy remarks and the mischievous thoughts.
They had rules that consist of
Do what your told when your told
Clean room
Good grades
No attitude
No lying
Don't be on you phone when people are talking to you
No swearing
Curfew is 8
No fighting
No arguing
No yelling
Don't run in the house
Don't drink, smoke, or do drugs
And be respectful.
And punishment are most likely grounding, soap, spanking.
Most times just a quick swat and glare was all that was done for small things.