

If I understand the question correctly, you need to know if it is the father or mother they share -- so you can show each with the correct parents; if all parents not known, add a profile as "Unknown" or "2nd wife of ..." or whatever fits.
Half-siblings share one parent, not both -- so you just create them that way -- or if necessary, use the edit relationships tab to move one (or both) from one set of parents to correct set.
The following people are listed as half relatives they are not and they need to be removed. Geni has decided that if you are not a premium member there is no way they are going to help you. I have probable being trying to solve this problem for well over two years.
The following listings are relatives of Arthur Ross Geissmann 1940
@Nancy Elizabeth Blaw 1924 – 2010, not 2012 shown as half sister (real sister)
@Eileen Estelle Buckby 1925 – 2012 shown as half sister (real sister)
@Arthur Ross Geissmann 1940 this is me how can I be my half brother.
@Burton Thomas Buckby 1920 – 1989 shown as half brother in law (real brother in law)
@George Ernest Buckby 1882 -1966 shown as half brother in laws father (real brother in laws father)
@Rose Matilda Buckby 18?? - 1950 shown as half brother-in-laws mother (real brother-laws mother)
@George Frederick Buckby 1911 – 1975 shown as half brother-in-laws brother (real brother in laws brother)
@Mavis Rose O’Connor 1908 – 2008 shown as half brother-in-laws sister (real brother in laws sister)
@Francis William Buckby 1920 – 1973 shown as half brother-in-laws brother (real brother-in-laws brother)
@Ruby Shambler deceased shown as half brother-in-laws sister (real brother-in-laws sister)
Private User - Geni has created a class of volunteers called Curators, who have extra abilities - and a "sticky" Public Discussion to ask them for help -- https://www.geni.com/discussions/172007 - post your requests there, and they will undoubtedly help --
however - please note: to get the "@" to work to create a link - you must pause before hitting the space bar and wait for the drop-down menu of choices, then choose from that.
The other way to create a link - which always works, as opposed to the "@" which seems a bit temperamental -- go to the profile, copy the numerical part - and enclose it between double brackets on each side "[[" and "]]" [do not put the quotation marks, do not leave space between inner bracket and the number]
I john stanley williams shaw have listed my 4 - siblings and then listed them again as half siblings.
They are not HALF SIBLINGS AND NEED TO BE REMOVED FROM MY PROFILE AND THEIRS TOO..
1. @Lynette Delia McGregor nee Shaw,
2. @Dianne Dorothy Woodhams nee Shaw,
3. @Williams James Shaw,
4. @Robert David Shaw.
CAN YOU REMOVE THEM OR ADVISE ME HOW TO DO THIS.
Thanks John Stanley William Shaw born 28/11/1947 in Subiaco WA Australia Geni Pro member
John Stanley William Shaw
For each of them, click Edit Profile, then at the top of the Edit Screen click Relationships.
Then click Remove across from the incorrect parent set, leaving just the correct set.
Then click Save.
If there are actually two copies of one or more of your siblings, then you need to merge the duplicates, possibly before doing the above.
There are many ways to merge: https://help.geni.com/hc/en-us/articles/229705547-How-do-I-merge-du...