Frodsham, have you been watching the BBC's Anne Frank's diary this week? If not then perhaps you should, what you are suggesting is simply a (much) milder interpretation of the Nazi ethnic cleansing regime! Yes I know this has nothing to do with race, but Hitler too saw fit to do away with homosexuals. To not expose children to homosexuality surely suggests that when they do come accross it, they would presume it to be wrong?
What if your grandchild, upon reaching age 12 had homosexual feelings, yet without programmes such as these having explained the idea of homosexuality the child would be in utter turmoil! would you wish that on one of your own?
We should have learnt from the nazi regime that such immature, short-sighted beliefs breed atrocities such as the holocaust. Luckily, your grandchild is part of a generation who will (hopefully) grow up with much more of an open-mind, and we just have to hope that your ignorance to people who may be born slightly differently, although not 'normal' are still just as part of normal society as you are will not be accepted by your grandchild. After all, we don't want another generation of Hitlers, we want more Gandi's please!!
I myself am very much heterosexual but am glad that the majority of people with such strong views as to yours belong to one generation. Should one of your descendants turn out to be homosexual, I will be one of the people accepting them as much as any other person.