A son-in-law can be like another son to you and the best part is you get to skip all the diapers, teen misbehavior, potty training, and college tuition. In short, you get to begin your relationship with your new son after the tough parenting is already done. Son-in-law’s birthday is the perfect time to show your appreciation for this wonderful relationship. Send your son-in-law this candles cake to wish birthday to terrific son-in-law.