We recently listened for 2 hours to a guy that lost his wife to cancer and every word held all spellbound my friend.
Don't time yourself and allow your heart to speak.
Everyone has truth registers and they will feel your words.
Make a place for tears and just pour the words out.
That's what I do every time and I have never recieved any critisism for it.
Instead the people cried and laughed with me.
Hope this will help you!
They'll be a captive audience I suppose so will have no choice but to hear me out. I'm pretty sure it will work out in the day, it's not the first time I've had to do this sort of thing and I'm not a bad public speaker. I'm certain things will come together and we'll send dad off with respect.
Sounds great and I like your confidence.
Just flow from the heart and everything will be awesome.
All strength to you guys!