I will give charityalms and volunteer to bring food on Thursday in the name of your mother ..., in order for your mother and sister to recover soon.

to give alms = religious
to give to a charity = religious and non-religious (a charity, an organization like an NGO)

I wat is better noI don't telling you what I would do, better to be between God and me... I don't like to brag.

if you haven't already told him/her, use the correction above.
if you already told them:
It would have been better not to tell you what I would do...

I will give to charity and volunteer to bring food on Thursday in the name of your mother ... in order for your mother and sister to recover soon.