Annabella of Strathearn - Wife of Sir Patrick Graham or of Sir David Graham l his father ?

If the reference (below) is correct, then this tree needs to be changed.

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From https://en.wikipedia.org/wiki/Patrick_de_Graham

Sir Patrick de Graham of Kincardine was a 13th-century Scottish noble.

Patrick was the son of David Graham of Dundaff. He was selected to negotiate the marriage of Prince Alexander of Scotland and Margaret of Flanders in 1281. He sat in the Parliament of 1284 and acknowledged Margaret, Maid of Norway as heir to the throne of Scotland.

He was Sheriff of Stirling by 1289 and was one of John Balliol's auditors in 1292 during the competition for the Scottish crown. Patrick swore fealty to King Edward I of England in 1292. He served Edward I in France in 1294. He died at the Battle of Dunbar on 27 April 1296.

Family
Patrick married Annabella, widow of John of Restalrig, the daughter of Robert, Earl of Strathearn and had the following known issue:

David of Kincardine
Patrick
John, Earl of Menteith
Margaret
Amanda

References
Barron, Evan Macleod, (1914). The Scottish war of independence; a critical study by Evan Macleod Barron. J. Nisbet.

According to Wikipedia, https://en.wikipedia.org/wiki/Robert,_"Earl_of_Strathearn, Annabella, who married firstly John of Restalrig, and secondly Sir Patrick Graham of Kincardine, who was killed at the Battle of Dunbar."

Then you're seeing what I am seeing and we will need to adjust the tree. That may affect DNA studies.