What should I write in a thank-you letter to the person who accompanied the ceremony after my mother died?

First of all, on behalf of my father, my brothers and sisters, and my whole family, I would like to express my sincere thanks to the leaders, distinguished guests, relatives and friends who attended the memorial service today! Thank you for coming here in your busy schedule and saying goodbye to my mother with us. During my mother's illness and hospitalization, thanks to the care of leaders, relatives and friends, I visited her many times and gave her great comfort! As a family, we are also grateful. Here, we also want to thank the * * * unit. My mother has been in poor health these years, and we are busy with work. It was the * * * unit that gave my mother and our family careful help. Here, once again, I would like to express my heartfelt thanks for the concern and condolences from all walks of life!