When parents welcome a second child into their family, it's always a toss-up as to how their older sibling will react to their presence.
For some, a new sibling isn't such welcome news as kids will feel they need to compete with the baby for their parents' attention and start to resent them for it.
But others will get just as excited as their parents and when that child arrives, the tenderness they can show even moments after a new birth takes place is often enough to make complete strangers cry.
And that goes a long way to explain why so many people are so touched by a heartwarming video that captures a little girl meeting her brother for the first time.
