It's a very easy song, but singing the lalala correct at
the beginning while playing the bass is quite hard =).
This is the song:
G -|-------------|------------|---------|--------------|
D -|-------------|5-5--------5|7-7------|--------------|
A -|--7--7--5---5|------------|--------0|3--3----3--3--|
E -|-------------|------------|---------|--------------|
have fun and make your mother happy, she deserves it =).
cheers, Marc