Hi, ESLD. Well, that's a bummer. I understand your feeling that it is taking away time from visiting and being with your dad. However, you are right in not wanting to expose him to your germs.
I have a little tip I'd like to share for the next time you start to feel a cold coming on. It is very important to do this at the first sneeze or sign of a sore throat or just feeling "blah." Take 2 Alka Seltzer Plus tablets in about 6 oz. of water, along with 1000 mg of vit. C. Four hours later, repeat this but do only 500 mg of C. Then again in 6 hours. That should knock it out; however, should it linger until the next day, continue with AS+ and 500 mg of C every 6 hours.
I've found if I do this before the cold has had a chance to "take hold," it works every time. If you wait too long, it won't work, though it will help you feel a little better. Of course, with kids around, it's nearly impossible to avoid catching their colds, and I wouldn't recommend the above regimen for children.
I hope you feel better SOON!
"But that was yesterday, and I was a different person then."
Alice in Wonderland, Lewis Carroll