Welcome to the forum, and to beekeeping.
# 1...Robbing is a possibility, but not as likely in the spring as in the late summer and fall. Keep the entrance reducer in place, using the smallest hole, until your bees are established and there shouldn't be a problem.
#2...Yes, but they will begin hanging comb in the area where you removed the frames, creating a mess. They will not use the frames if they have other space available.
#3...NO, if a mother moves into a house alone, all the neighborhood children will not come flocking over to live with her.
All the bees in a hive are the children of the queen. She is their mother and they will not leave her.
# 1...Robbing is a possibility, but not as likely in the spring as in the late summer and fall. Keep the entrance reducer in place, using the smallest hole, until your bees are established and there shouldn't be a problem.
#2...Yes, but they will begin hanging comb in the area where you removed the frames, creating a mess. They will not use the frames if they have other space available.
#3...NO, if a mother moves into a house alone, all the neighborhood children will not come flocking over to live with her.
All the bees in a hive are the children of the queen. She is their mother and they will not leave her.