[en] Existing experimental proton stripping reaction data on ²⁵Mg leading to threshold states in ²⁶Al are reinvestigated and reanalysed in a consistent and improved manner. We have used unbound state form factors in the DWBA analysis of the measured deuteron angular distributions to deduce absolute rather than relatives proton partial widths. For higher-lying resonances these values are compared to widths obtained from (p,γ) work. It is also shown that several of the unique J^π - values assigned previously to ²⁶Al states are erroneous. The present work reports on reanalysis of spins, parities and isospins for ²⁶Al states located at Ε_χ <8.00 MeV. We have deduced new stellar rates for the reaction ²⁵Mg(p, γ)²⁶Al and compare our results with previous values. Furthermore shell-model calculations for the mass A=26 system have been performed. Theoretical excitation energies, J^π-values, γ-ray transition strengths, spectroscopic factors and proton partial widths are compared to experimental data and new shell-model assignments of experimental states in ²⁶All are derived. We have estimated Coulomb displacement energies of excited ²⁶Mg and ²⁶Si mirror states and present new analog assignments for T=1 triplet states in A=26 nuclei. Based on shell-model results and analog state information we present updated stellar rates for the ²⁵Al(p, γ)²⁶Si reaction. (authors)