It sounds as if he needs a better teacher tbh.
When I teach this kind of thing to primary aged children even very basic phrases need a lot or repetition. They don't necessarily need to see it written down, and modern MFL teaching advises you not to for primary, but personally I like to.
To learn this particular task I would:
Choose 3 very simple questions (I can't do accents on this, so sorry for that)
*Comment t'appelles-tu? Je m'appelle Fred
*Ca va? - Ca va bien merci / Ca va mal
*Quel age as-tu? J'ai dix ans
I'm assuming that you aren't too hot at French yourself, apologies for this but in case, here is your (kind of) prununciation:
*Kommon tappell too? Jemappell Fred
*sava? cava beeyen mersee / sa ne va pa
*kel ahje a tu? Jhay dees on
Firstly I would go through it with him, asking him what he thinks about the sounds of the words. For example, he might notice the age bit in the age question, he might think that comment sounds a bit like common, which is like a park, or that Ca va sounds a bit like Sarah. He will probably pick up on the fact that the answers are very much like the questions. Anything that he notices is good, as it gets him thinking about the way the language sounds.
If he doesn't notice it himself, point out to him that your voice changes when you ask a question, as it goes up at the end. Give him examples in English.
If you like, get him to write it down. If you do this on pieces of card, he can play pairs, by turning them upside down and matching them up, or you can play snap together.
I would probably deal with each question one at a time. So for the name question, ask him and he should respond. Get him to ask you, DH, anyone else he comes into contact with. Keep repeating as much as possible, and if you can, in a particular sing-song way that he can get lodged into his brain. I have a song that I like to use for this question, but unless you speak Welsh (~?!) you probably won't know it, so try and thing of your own little ditty.
For the second question, after lots of repetition, you can use your face to give him visual cues. Get him to ask how you are, and pull a face. HE then answers the question. You can have a lot of fun going through magazines or just watching TV and getting him to tell you how people are.
For the last question, I'd do the same things again, but experiment with different numbers. He should know up to 10 at least I'd think. If not, write them down for him. Find some pictures of children and get him to guess their ages. Do the same with your fingers. Children really love mini whiteboards, so if you can write a number and he answers as quickly as he can he'll be motivated.
Using anything that he really loves will help, so if he likes football, use pics of footballers to guide you. Ask him to pick a footballer (or famous person, whoever) to "be" and you "interview" him. Then you pick someone and afterwards he has to tell you all about that person. Make it fun, it shouldn't be a chore.
All in all, he should be fine. Even if he struggles, by the time he gets to secondary school it will get ironed out. Different teaching methods are used at secondary and they are often more effective. Don't worry. :)
Sorry about the essay!