How wonderful for you John, that Mrs L is earning a great wage. You will find, however, that 'being at home all day' isn't all it's cracked up to be! A stay-at-home Mum (or Dad in your case) does the equivalent of 2 full time jobs, without being paid of course!!
My kids are at school but my holiday timetable, is to do jobs in the am and then go out all afternoon. We live on the beach, so I take them for a dig! We also go to the park, fair, feed the ducks by the lake and generally have plenty of exercise.
Today we are taking a picnic to the sandhills and then having a walk/run/dig. Good Luck John!