Don't do it
If you are happy where you are I don't think you should come to KA.
First of all.
A major airline in Europe on A330 must be a happier place than KA.
You must have at least one good nightstop a year. In KA you will never have one.
For 20 K you can't find something for a family but if you add 10-15 it is ok. Then you have to consider the schools. This will make your selection of where to live more restricted.
The schools will not be fully covered by KA. Also if your kids are young they don't pay anything.
Time to command can be 2 years and it can be 10 years. For the moment there is a lot of activity but also many many failures.
The pollution is almost no 1 discussion here one the flt deck. I would not like to bring my kids into this. I have invested a lot in filters for my home, only future will tell if it is enough.
I would only take the KA job if I was unemployed or I needed the rating to get into another job.
That said....
The salary is ok.
The annual leave system is great.
The roster, destinations, nightstops, training, world record holder of ATC delays.....no brainier.....stay in Europe.