Treating a toddler - suggestions welcomed!

My 5 year old daughter and nearly 7 year old son are currenty taking Bioray's Artemisia & Clove (Ingredients: Certified organic green walnut hull, grapefruit seed extract, olive leaf, Artemesia annuavera, Artemesia absynthium (wormwood), fresh ground cloves, red clover, hericium, and wild American ginseng, and 18% grain neutral spirits as a preservative).

I'm pretty sure everyone in the family is affected, as it's doubtful that 2 of the kids are the only ones with parasites. My husband and I have just started treatment for ourselbes yesterday, but my problem is whether or not to treat our youngest son - he is 15 months old. Should I treat him too? If yes, what is considered safe? He is approximately 25 pounds.

I think I'm even going to treat the cat! With the full moon yesterday, he threw up twice, and he hasn't thrown up in months!