Your main focus during the last ten days and nights of Ramadhan should be worshiping Allah. However, you can do these without compromising your duties to family and community.

You should help in preparing ifthar, etc., but those activities should not prevent from praying your isha and fajr in the mosque in congregation. As Imam Shafi and others said, "If someone prays isha and fajr in jama'ah, they would get the blessings of the night of qadr". This, however, is not meant to say that one should skip praying taraaweeh. Of course, we are ordered to apply diligently to extra acts of devotion in these blessed days.

If you are helping the orphans with their ifthar, you can definitely pray with them; by doing so, you would not be depriving yourself of the rewards of jama'ah.

Lastly, whatever activities or duties you normally perform you can still engage in dhikr. The Prophet was asked by one of his companions, "Islamic prescriptions are many to keep track of; so, tell me one thing that I can cling to always. The Prophet (peace be upon him) replied, "Let your tongue be busy with dhikr Allah." (Reported by Tirmidhi on the authority of Abd Allah b. Busr)

I pray to Allah to help us seize the maximum blessings of the last ten days of Ramadhan, and make us all worthy of being freed from hellfire.