couple id, family panel data

[Sunniva]

Dear stata users,
In my data I have children, mother and father. There is one record for the child, and the parents have one record for each child. I will compute a couple-id variable. How can I do this.
The data look like this, in this example below there are 3 children and their parents:
Many thanks

children_id	mother_id	Father_id	year
1001	1	10	2003
1002	2	20	2003
1003	3	30	2003
1001	1	10	2004
1002	2	20	2004
1003	3	30	2004
1001	1	10	2005
1002	2	20	2005
1003	3	30	2005

[Andrew Musau]

egen parent_id= group(mother_id Father_id), label

assuming mother_id and father_id are distinct across households. If not, you will have to include a household id when defining the groups.

[Sunniva]

Many thanks Andrew.