"Strong roots produce beautiful leaves" - is a wonderful way to show grandparents appreciation. Child's photo can be glued on the space of love heart or child can draw their face. After that child can be offered to colour in tree as well and present to their grandparent. This can be a part of Tree Unit or Family Unit.
Decorative Wood Sign Plaque Wall Decor with Quote "The roots of a Family tree begin with two Hearts." Carved and Painted 11.25"x11.25" Black/Antique White by TimberCreekDesign.com, http://www.amazon.com/dp/B0041T7HSE/ref=cm_sw_r_pi_dp_JVxDqb0VJXGP2