Keep your remarks short. Focus on telling stories about your dad - fun and happy ones like taking him to practice and seeing his joy. It’s when I ended my talk and said I would miss him that the emotions came on strong. Talking about him being happy and doing good kept the emotions at bay. Good luck.
I actually got a call in the middle of the night last night from my sister telling me that her husband passed away unexpectedly in his sleep. He was only 65. Life is precious. Treasure every moment with loved ones.