This has happened on 2 consecutive days this week. Parents have brought the 6 or 7 year old sibling to toddler group with their younger sibling because they are off school with headache/abdominal pain/viral symptoms. And these siblings have sat in the baby corner! I have a 3 year old and a 9 month old. When the 3 year old is too ill for nursery or meets exclusion criteria I wouldn't then take her to a play group instead. (I am a GP so not unfamiliar with being around bugs all the time!)
Surely the reason they are off school is two-fold. 1. To give them recovery time and rest and 2. To try not to spread their virus around school.
I understand that it's hard being at home with your child is ill but why should the well population be entertaining the poorly child, and harbouring their virus, instead. Coughs, colds, runny noses are the norm. But a school aged child who has been kept out of school should therefore also be too ill to attend toddler group, where it doesn't matter if their younger sibling misses a week.