A three month sibling passed away and the older brother wants to read scripture at his funeral

My condolences for your loss.
Here is a website that might have a scripture: http://arksoaper.wordpress.com/our-story/scripture-to-comfort/
I wish you and your family much strength in such a hard time.

I am sorry for your loss, and of course scripture can depend if you are Jewish, Christian or Muslim as to even where to look for them.

Also in some cases they merely write a letter to them telling them good bye.

Numbers 6:24-26
Revelation 21:4
I Corinthians 15:22
II Corinthians 5:6-8
I Thessalonians 4:16-17
John 11:25-26
Psalm 34:19
Matthew 11:28-30

I hope this helps. I am so sorry for your loss.