You could do Form IA with both. The 9 yo could do the optional extra work for older students. Then next year you would leave the 7 yo in IB, but decide if the 9 yo is ready for Year 4 or should stay in IB.
Kathy
For we are God’s handiwork, recreated in Christ Jesus, that we may do those good works which God predestined for us, that we should walk in them.
For we are God’s handiwork, recreated in Christ Jesus, that we may do those good works which God predestined for us, that we should walk in them.