This is just my opinion (that's my disclaimer), but tell her to wait a few years. Chances are, your aunt will put him in a school and I guarantee he will have quit in 6 months (12 months tops).
I had a lady call me last week wanting to put her 3 year old in my class. I asked her how she would feel about me teaching him arm breaks and phrases in Japanese and she didn't like that idea. I asked her (politely) what she thought martial arts are. She has friends who go to schools where they get belts from running around traffic cones and thinks that 8-year old black belts are normal.
I am sure many here will disagree and say that their neighbor's sister's dog groomer's son started when he was 4 and he is still in it and he is not 16, but what are the true statistics there? What, maybe 5-10% of students under the age of 8 stick with it for more than a year? Then, how many stick with it for 2 years? What about 3 years?
I feel that the older the student, the lower the dropout rate becomes.
How many of us feel that they have a 7 year old student that is beating the odds when soccer season rolls around?
This is just my opinion though.....
AoG