From the Telegraph:

Parents will be allowed to create children specifically to help cure older brothers and sisters of common conditions under proposals unveiled today by MPs and peers.
For the first time, couples could use so-called “saviour siblings” to treat other family members suffering the kind of serious but non-fatal ailments that affect millions.
Presently the law allows parents to use IVF procedures to select embryos that will be a genetic match to older siblings with life-threatening diseases, such as a rare blood disorder.
But a joint House of Commons and Lords committee today calls for the law to be relaxed to include other illnesses.
This could lead to children being created to help treat diseases such as sickle-cell anaemia, renal failure, kidney disorders and spinal diseases.