I would be really grateful if somebody could please answer a couple of questions for me

We are travelling from Manchester to Corfu on mon 20th july flight 1828 at 11am,which airline is this?
Also there are 4 of us with a bagagge allowance of 15kg each, both my daughters have a case each that will be 15kg, but would I be able to share 1 case with my husband that weighs 30kg or do we have to have 1 each?
Many thanks