Ответ:
1. Marc, who's dad comes from Paris, speaks French.
2. My sister, who's lives in Dublin, sings in a band.
3. Last summer I visited Ireland, where my feather was born.
4. I can't find my new coat, which I bought last week.
5. My uncle, who has got a yatch, very rich.
6. Jan works for a big company, which makes toys.