The following are the word families I have introduced until lesson 7.
at, an, ap, og, ig.
I have introduced the following word families from lessons 8 to 27.
ug, un, ut, ot, oo, oat, en, ox, ay, ing, ee, ell, ill, ip, sh, ch, ng.
By the time your child finishes lesson 30 he should be able to read at grade level.
You may of course create your own list of words using the other word families found in this website which is from where I selected the word families introduced in my lessons.
I have uploaded lessons 1 to 6 and the preface and notes onto YouTube which you may access here.
Here is the link to my YouTube channel for lesson 8.