no. Just ask for the school's permission.
Personal family reasons are a pretty good reason, i'd say. Life's too short.
Skiing in the Alps - less so.
That said, i think there's a rule over the number of days a child can be absent before they cnnot finish the year.
It is not a very high number - 20 or so.
not sure if this is a KHDA requirement, or a school specific requirement