Thanks everyone for everything you've said. Taylor77 you've made a very good point. Her daughter won't be a problem though. We get on pretty well and we all have a good laugh together, however I've now been roped into watching vampire diaries with them on Netflix (and it's surprisingly not too bad).
Not too long ago she started talking about 'us' and I told her how I feel about her. I'm glad to say that we both share the same feelings for each other. Her entire family know about me and I've been thinking about telling my family about her. She's not too happy about it because she's worried about what my parents will think. Reckon it's going to take a bit of time until I can actually tell them.
Thanks again for all the support :)