I have provided below a link to the Texas child labor law, which provides the details for working hours and jobs allowed for a 14 year old.
The list of jobs which he cannot perform is very comprehensive. Basically, he cannot work with machinery or around any dangerous substances or dangerous locations.
If he is not in school, he may not work more than 8 hours a day or more than 40 hours per week under the Federal Child Labor Laws. The site provides both the Federal Law and the Texas Law. When they are different, the more strict law applies.
There is a very helpful section listing the "Permitted Occupations for 14-15 Year Olds". Use this section as your guide.
Hope this helps.
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