It may well be possible to give the place to your sons AND keep it out of your estate so its value is not in pot for purposes of any election Hubby may chose to make against will. If you leave Hubby too smalla % of your estate he has right to elect otherwise--but thats only 1/2 my point--if you remove home from estate its a done deal and not subject to election math. Now some states have laws that try to prevent such last minute stripping out of the estate but if you happen to be in a state wich does NOT have such a reconstruction feature you may be able to strip it out ahead of time.
There may be other ways to do it.
Now before you say that messes up the "free" step up on death tax basis you were counting on for sons at your death --that may not be true if you reserve a written life estate in the property and continue to exercise dominion and control over it----that causes the gift to be treated as defective for federal tax purposes and tossed back into the pot to be taxed anew and stepped up. Usually this defect is a tax problem but sometimes it works as a plus!
Some folks apparently design estate so as to favor kids over spouse but I strongly suggest you sort it out with tax or estate counsel now as to what should work in your fact pattern--if you get it wrong and you predecease Hubby its rather hard to come back to sort it out!