Need travel help - Europe / Spain


We are a family from the US.

We would like to go on an escorted tour of Europe.
Approx 7 to 15 days.

We would like to start the tour from Spain. Would such tours starting
in Spain be conducted in English?

Would any one recommend or know of such escorted tours?

Please let me know.

Would Spain be warm in December?

Thanks in advance for your help,

Irfan Smith