Traveling with children and travel insurance

I had to look into travel insurance for this holiday because we have the kids traveling with us. It will be the first real holiday we have had in 3 years, before now Simon and Jessica have always been too young to travel. We probably could have done something last year, they are 3 and 4 years old and are really well behaved but we just thought it would be too much trouble. They are both very attached to our dog, and they don’t like staying away from home. We are going to see my sister in Dublin for 3 weeks, and then on to London. I haven’t seen my sister in 3 years either, and I want her to finally meet Simon and Jessica.