1. Present simple tense: Used throughout the answer (e.g., "plan their trips," "need to fit their travel") to talk about general habits and routines, which is appropriate for this type of question.
2. Use of "so" for reason: "so they don't miss any classes" and "so they usually take time off..." clearly link actions to reasons, showing cause and effect.
3. Use of "when" clauses: "when the kids are off school," "when their workload is lighter"—these time clauses add detail and show the ability to use complex sentences.
4. Idiomatic expressions: Phrases like "fit their travel around" and "comes down to coordinating" demonstrate natural, conversational English.