Respiratory tract infection-3 infected, one still free

Ya, myself, HX and HE were all down with fever and cough and running nose, one after another, first me, then HX, then HE. I am not so worry about HE since she is already 3 and all this while she has been quite strong to withstand any cough or cold, normally she would have cough for 2-3 days then no more, without fever at all. However, this time also she end up with fever for nearly 2 days.
HX, on the other hand, make me worry more, since she is only 5 months old. I start to regret that I didn't make hygienic precaution like wearing masks or using alcohol handrubs. I thought HX should be protected by getting the antibody through breastfeeding. But it seem this virus is reall strong one (otherwise HE won't have fever). HX has a bad blocked nose wih occasional cough. She has fever only for one day, then no more for the next 2 days. However the fever returns again yesterday and couldn't settled by tepid sponging until she is fed paracetamol syrup. I am quite worry as I am concerned about supreimposing bacterial infection. If today there is anymore fever, I need to bring her to see doctor again especially to check her lung. Her blocked nose is so bad that she has to open her mouth to breath. When she is breastfed, she has to unlatch several times to catch some breath. Poor little baby. HX also becomes quite cranky and keeping requesting (by making pitiful sound) to be carried.
As in this time when I am typing, I thank God that HX fever has settled, today she has no fever, but blocked nose and cough are still bad, HE also has some mild running nose and occasional cough. Overall, it seems getting better though. I hope all this is getting over soon, as I am so exhausted, being sick and taking care of the sicked children. Thank God for hubby, the only healthy standing, has helped to take good care of us