Here’s a closing benediction for Mothering Sunday or Mother’s Day. It comes from the Mothers Union website.
Blessing for Mothering Sunday
May the Lord who brought us to birth by his Spirit,
strengthen us for the Christian life.
May the Lord who provides for all our needs
sustain us day by day.
May the Lord whose steadfast love is constant as a mother's care,
send us out to live and work for others.
And the blessing of God Almighty.
the Father, the Son, and the Holy Spirit,
be with you and remain with you always. Amen.
— from a collection of Mothering Sunday Prayers produced by Mothers Union, and posted on their website.
For more worship resources for Mother’s Day, click on Mother’s Day in the list of “Labels” at the lower right side of the page.