You can give some good speeches by knowing the scriptures and comparing scripture with scripture concerning( the family ). The bible has more to say about family of God in new testament, but if you ask lord to help, he will show how familys grew in maturity. The old Test. Gives insights into solid familys, If your want a family message on trials and affliction, JOB is a good, but you maybe want a family friendly audiance,so The Kings usually had sons that walked in their fathers/mothers footsteps, best thing to do is search the scriptures or go online and type in men and the bible or women or biblical familys ect
Choose an appropriate scripture passage, and expand on it. I Corinthians 14:34-35 is always good.