What is your mother like?

Cò ris a tha do mhàthair coltach?

If you are nosey and you want to learn more about a particular family member, you already have the sentence structure to do this.

Cò ris a tha an aimsir coltach?
What is the weather like?
Cò ris a tha an t-sìde coltach?
What is the weather like?
Cò ris a tha … coltach?
What is … like?

Just substitute the weather with the person in whom you are interested.

Cò ris a tha do mhàthair coltach?
What is your mother like?
Cò ris a tha a seanmhair coltach?
What is her grandmother like?