No such thing as 'lazy' kids - just unwilling to do chores
First, we have to differentiate lethargy from unwillingness to do chores. Lethargy is the inability to do anything due to physical malaise. We might call the kid 'lazy' when in fact the kid is already manifesting symptoms of a psychological or medical condition. Give a kid who is slumped on the couch watching TV five bucks and tell him/her to go to the arcade and he/she will be out the door in a flash. Tell the same kid to go to the store and buy groceries and his/her butt will weigh a ton, even if you give him/her six bucks. The key really is upbringing. You should start them young. As soon as they can, they should be asked to do simple chores like putting away their toys, helping in setting the table, etc. Always, show your appreciation - thank them for helping out, show them how happy you are. Perhaps, you may give them a treat. But not always, lest they begin to think of the treat as payment or bribe. Make doing the chores fun, if you could. For older children or teens, then a sit-down may be needed. Say that each member of the family has a role to do. Yours, as father, is to earn the money for the family to spend on theirs needs and their role is to help you by doing the chores. I was left with 4 kids by myself when my wife passed away. She raised them well. I did not have to resort to 'tough-love' to get them to help out.