4 weeks ago myself & our 18 month old border collie Jack moved back into the family home due to issues with Covid 19 so as to not endanger other family members after 6 months of being out of the family home. For the first 3 weeks everything was fine but in the last week Jack has first bitten my daughter with absolutely no provocation who is 12 and was stroking him as normal with my wife before going to bed in the lounge and now my wife last night again with no warning or provocation. We love him dearly and we are at our whits end as to what to do they are now both petrified of him in case he turns again on them both.