What they would miss...

Little Man most of the time will sleep till 7:30 or 8 am.  If the girls were to attend public school and ride the bus, these 3 would not see each other all day.
When the girls got home and ate a snack, did there homework, played very little, eat dinner, shower, bed, they would not have 'time' for their brother, or their family.  

Homeschooling is not easy, but I am so,  so thankful we have the freedom to do so and I am thankful even on the hard days we have these moments.