Family no longer coming to stay (head lice-related)

[boobashka]

My brother and his family are in the UK for the holidays staying with my parents (2hours away). Since October the plan has been that they will come to ours for 3 days over New Year. So I have filled the fridge, booked a meal out, and in the last couple of days cleaned house from top to bottom and organised beds and bedding for everyone - 11 people including my other DB. I discovered head lice in myself and DD yesterday - promptly treated with Full Marks and thorough combing with the fine tooth nit comb. Now my brother and his wife no longer want to come here to stay in case their two DC (age 4 and 2) contract nits.
AIBU to be think that their decision is super selfish? My mum has been on the phone in tears (first time all her grandchildren were to be together) and my two DC are upset to not be spending time with their little cousins.

I cannot find anything at all in any DOE guidance or policy that states you are not allowed to tell a parent or carer their child has head lice.

There is plenty in the policies to suggest one should be tactfully told and given an advice leaflet on treating them

Neither of mine (7 and 3)have had nits so far, we tend to use preventative shampoo. You can get spray to deter them too, suggest they just buy some?