how can sth stronger?

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my mother miss my father very much.actually,i and my sister both miss him,too.But we must be stronger and hope my mother can be stronger,too. today when i called my mother,i was hearing my mother crying.she said she missed our father.i dont know what i should say.i kept silent and told my sister.as parents,selfless and devotion.so far,my father has left my mother forever. as their children,what should we do make our mother happy?i dont know.Can you gvie me some suggestions?