You don't mention how old your children are. If they are the same age as the 4/5 yr old or play nicely then it could be nice for you. If there is a huge age gap and you can afford taking the summer off you could talk to your families about putting their kids in summer camp and close for the summer. Parks and rec camps are really reasonable and between that, parents taking time off and family members taking their kids for a wk or so it could work out really well to close for 2 mos and focus on your new family member.