Welcome to HCM
Your cousin is having two health related isseues one is Hypothyroidism
which is clinical or subclinical confirmed by High level of TSH value and other tests about which you have not given any information. But if advised supplimentation of hormone take it and be in constat follow up.
Hypothyroid state needs investigations related to Autoimmunity like AMA( Microsomal antibody) Anti -throglobulin antibodies
Another is being Overweight
which is related with intake of calorie rich food and lack of physical exercises.also genetics are important.
One should find out ideal weight according to height and plan to exercise regularly and reduction in high fat and high carbohydrate
diet will result in significant weightloss.
Take the help of Dietician and Gym Trainer or join some out door sport.
To some extent a Yoga can help.