Mothering Sunday falls on the fourth Sunday in Lent.
The Church of England Common Worship lectionary provides a different set of readings from those set for Lent 4. They are:
Old Testament: Exodus 2.1-10 or 1 Samuel 1.20-28
Psalm 34.11-20 or Psalm 127.1-4
New Testament: 2 Corinthians 1.3-7 or Colossians 3.12-17
Gospel: Luke 2.33-35 or John 19.25b-27
ROOTS has produced materials for these readings and many other all-age services with a theme connected to Mothering Sunday.