Family visit visa extension

Hi ,
1. Is it possible to extend family visit visa issued for 90days ? Suppose if we show medical reasons of our kids to take care and both are working .
2. What is the cooling off period to come again from india ?

Many thanks,

1. No
2. By definition, a short-stay Schengen or C visa allows the visa holder to stay in the Schengen area (including Belgium) – but not work – for up to a maximum 90 days (three months) in any 180-day period. So I would assume one visa application per 180 days period. Official description with some helpful info: https://dofi.ibz.be/sites/dvzoe/EN/Appl … poses.aspx

Thank you very much