Exodus 12:4,7,13 NASB
Now if the household is too small for a lamb, then he and his neighbor nearest to his house are to take one according to the number of persons in them; according to what each man should eat, you are to divide the lamb. Moreover, they shall take some of the blood and put it on the two doorposts and on the lintel of the houses in which they eat it. The blood shall be a sign for you on the houses where you live; and when I see the blood I will pass over you, and no plague will befall you to destroy you when I strike the land of Egypt. Feast of Unleavened Bread
Verse 7 says the blood was only sprinkled on the door posts of the house were the Passover lamb was eaten.
Seeing that the sign for the death of Angel was blood on the door posts:
1) Was blood also sprinkled on the neighbours door posts?
2) Did the neighbours also sacrifice their own lamb but shared because of numbers?