Folks that relocated abroad for work with a partner or kids, what did you underestimate?

For people who moved abroad for work with a spouse/partner or children, what do you wish you had thought through more carefully before saying yes?

I don’t mean movers, packing, shipping, or the usual logistics. I’m more curious about the decision before the move became real.

Things like:
- whether the relocation package was actually enough
- spouse/partner career impact
- school or childcare timing
- housing costs or assumptions
- tax, payroll, or social-security surprises
- healthcare or prescriptions
- visa/work authorization delays
- language barriers
- being far from family/support
- the first few months after arriving

Was there anything that seemed manageable before the move, but became a much bigger issue once you were there?

And if you had to make the decision again, what would you check before accepting?