For some simple ideas to bring Lenten practices home for your children, take a look here: Simple Lenten Practices for Children Stations of the Cross Ideas for Kids
"Best Lent Ever" from Dynamic Catholic. Sign up to get daily emails with brief spiritual reflections, videos, etc. Only takes a few minutes a day, but really helps get into the Lenten spirit and prepare for the coming of Easter.
"Pray More Lenten Retreat" is an online retreat from Pray More Novenas. Note that the content at the link changes seasonally, so as we reach the end of a liturgical year, it will switch over to Best Advent Ever.