Perhaps they can carve only the heads of the two. Remember that the love represented is the most important part. Perhaps young crafters can carve their soap in the shape of a heart, and scratch a parent and child in it with toothpicks. Soap shavings can be moistened and squeezed into soap balls to avoid waste. Test your soap for ease in carving.
Some brands work better than others.
Depending on the age of your crafters, you could supply balsa wood and knives suitable for carving wood, and do the same project that way. These pages are for information only are not intended to be an official representation of the countries or the churches.