It doesn't matter what hearing aid you have or how well tuned it is to your individual hearing loss, they all struggle in situations with background noise. This is by far the biggest problem hearing aid users encounter.
The problem is that hearing aids tend to pull in all the sounds around you, so the tv, the kettle and someone talking will all feed through your hearing aid at a similar level and it is very difficult for you to separate them and focus on one particular sound.
There are a number of things you can do. How many switches does your hearing aid have? Many have a 'background noise' setting, if you switch over to this when you are in a noisy environment, it should help drain out some of the noise and make it a little easier for you to concentrate on speech. Also, you should face the person you are speaking to, and be closer to them than you are to say, the tv. If the same situation crops up again, ask them to get your attention visually first, and then turn the tv sound down to talk to you.
Is your hearing loss quite recent? It sounds like your family perhaps do not fully understand the difficulties you have. The RNID website has a lot of useful information, they can also provide leaflets which explain what it is like to have a hearing loss and how people can help you hear better.
http://www.rnid.org.uk/information_resou…
Do you go to any deaf / hoh clubs? You will meet other people in the same position and be able to swap tips on coping tactics.
I do understand how frustrating it is when people don't realise you can't hear, especially your own family. Hearing loss is as much of an adjustment for them as it is to you, and it will take time for them to learn how best to communicate with you.
Good luck.