You asked

How should I respond to my child's questions about being gay?

It’s good to be prepared for the possibility that your child may come to you with questions about their sexuality.  It’s common for teens to have doubts, mixed feelings or questions surrounding their sexuality.
While some teenagers may not feel comfortable confiding in their parents, if your teen does come to you, the first thing to do is to reassure them that their feelings are perfectly normal and quite common.
Your child should understand that lots of teens go through phases of doubting their sexuality and many people don’t realise they are gay until they are older.Speak to your child openly and honestly about being gay and reassure him or her that you love them no matter what.
If your child is gay, lesbian or bisexual then you also need to ensure that they know about safer sex messages, how to protect themselves against STIs and pregnancy.

More questions

It's common for teens to have questions about their sexuality...
The topic of birth control and protection can be particulary difficult to broach as you don't want your child to feel that you approve of sex at her age.
Firstly, parents should realise that they won’t be able to plan these conversations as conversations with teenagers rarely take place when and how their parents want them to.
As your teenager grows, it's important to be there to listen to your child but allow them to make their own decisions about friendships.
The essentials tend to remain the same each year but as your child gets older they may need extra items.
Your child will have an Individual education plan that outlines exactly what services your child will receive.
Any child who received special education resources or support in primary school will almost certainly be eligible for the same support in secondary schools.
If your child has been receiving extra help in primary school it is important to look for a secondary school that will suit his needs
There are lots of things parents can do to support their child in secondary school.
Transition Year is a one year school based programme between the junior and senior cycle