It is a tough decision, I had similar challenges regarding illness in m family in the UK in March

I don't think its unreasonable for people to ask you to return, however the should respect whatever decision you come to.

As well as the health implications, you need to consider the tax implications if you end up living and working n the UK for more than 90 days in any one tax year,

my own experience is that the travel itself will be OK. The quarantine on arrival in the UK would mean you would, in theory, mean you could not meet with family members for a period of time and this would potentially be a bigger challenge, especially for your child.