Tú casa es grande.

The difference between "tú" and "usted" depends on the formality. "Tú" is used <u>when talking to friends or relatives (informal)</u> while "usted" is used <u>when talking to older people or a person of high social rank (formal)</u>.
In this case we want to write the <u>informal</u> form of "tú", so we use "tú". Also, when dealing with <u>permanent states</u>, the verb "ser" (to be) is used.
Not enough information it says “The mom does exercise..” like okay but what about it? I can help but I need the rest to answer the unfinished question.
Answer:
el sentido de la comunidad influye indirectamente en el bienestar a través de la autoeficicacia de afrontamiento cognito y de afrontamiento social, de forma que aquellos usuarios que con el apoyo de la asociación han logrado un mayor sentimiento de pertenencia comunitaria, también han desarollado mayor potenciación.