lol I like this comment :) but isn't it supposed to be:
- Har du sett min son? (Har=have)
I think what you have might be: Here you see my son? (Här=here)
People sometimes try to make orange behave like a normal Swedish adjective, but then it gets very hard to spell instead. I suggest treating it as uninflectable.
eat and äter are present tense whereas ate and åt are past tense.
I dag äter jag en orange fisk. I går åt jag en gul fisk.
Today I'm eating an orange fish. Yesterday I ate a yellow fish.